adding initial documentation
updated links now that we're in a repo
added reference to requirements
fixed typo
major update to spec based on first round of feedback
added document history section
minor revisions based on feedback
updated spec
additional updates
additional revisions
reviewed text top to bottom and cleaned up wording
clarified text based on group review
changed text with suggestion from Gerald
fixing markdown formatting of open issues
added proposal for array comprehensions
spec changes from steve
Started comparison of UnQL to SQL
Add more comparison points - select, filter etc
Fix invalid query
Fix null FROM